import Vue from 'vue'
import Router from 'vue-router'
import Login from '@/components/Login.vue'
import Home from '@/components/Home.vue'
import Welcome from '@/components/Welcome.vue'
import Users from '@/components/user/Users.vue'
Vue.use(Router) 
const router=new Router({
    routes:[
      {path:'/',redirect: '/login'},
      {path:'/login',component: Login},
      {path:'/home',component: Home, redirect:'/welcome', children:[
        {  path:'/welcome', component: Welcome },
        {  path:'/users', component: Users } 
        ]
      }  
    ]
})
//挂载路由导航守卫
router.beforeEach((to, form,next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  //     next()  放行    next('/login')  强制跳转

  if (to.path === '/login') return next()
    // 获取token
    const tokenStr = window.sessionStorage.getItem('token')
    if (!tokenStr) return next('/login')  //未登录跳转到登录页
    next()
})
export default router
